MoS2 nanobelts-carbon hybrid material for supercapacitor applications

Abstract

The MoS 2 nanobelts/Carbon hybrid nanostructure was synthesized by the simple hydrothermal method. The MoS 2 nanobelts were distributed in the interlayers of Lemon grass-derived carbon (LG-C), provides the active sites and avoid restacking of the sheets. The structural and morphological characterization of MoS 2 /LG-C and LG-C were performed by Raman spectroscopy, X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The electrochemical measurements were studied with cyclic voltammetry, the galvanostatic charge-discharge method, and electrochemical impedance spectroscopy. The specific capacitance of MoS 2 /LG-C and LG-C exhibits 77.5 F g −1 and 30.1 F g −1 at a current density of 0.5 A g −1 . The MoS 2 /LG-C-based supercapacitor provided the maximum power density and energy density of 273.2 W kg −1 and 2.1 Wh kg −1 , respectively. Furthermore, the cyclic stability of MoS 2 /LG-C was tested using charging-discharging up to 3,000 cycles, confirming only a 71.6% capacitance retention at a current density of 3 A g −1 . The result showed that MoS 2 /LG-C is a superior low-cost electrode material that delivered a high electrochemical performance for the next generation of electrochemical energy storage.